Plant Oils

Question 1

Describe why vegetable oils are important in foods…

Answer 1

Provide a lot of energy and have a very high energy content. Nutrients in vegetable oils from seeds contain vitamin E. And fatty acids for many metabolic processes.

Question 2

What bond does unsaturated oils contain?

Answer 2

C=C double bond

Question 3

What happens with unsaturated oil in bromine water?

Answer 3

Unsaturated oil will decolourise bromine water (as the bromine opens up the double bond joins on).

Question 4

What are monounsaturated fats?

Answer 4

Monounsaturated fats contain one C=C double bond somewhere in their carbon chains. Polyunsaturated fats contain more than one C=C double bond.

Question 5

What is hydration?

Answer 5

A reaction with water/ steam.

Question 6

How is ethanol made by fermentation?

Answer 6

Fermentation is used to produce ethanol from sugar by: dissolving the sugar in water, adding yeast to the sugar solution then leaving the mixture for 3 days.

Question 7

Suggest how the solid waste yeast is removed and how ethanol is obtained from the solution…

Answer 7

By using a filter or decant to remove the yeast.